Urine is put into an electrolytic cell, which cracks the urea into nitrogen, water, and hydrogen. The hydrogen goes into a water filter for purification, which then gets pushed into the gas cylinder. The gas cylinder pushes hydrogen into a cylinder of liquid borax, which is used to remove the moisture from the hydrogen gas. This purified hydrogen gas is pushed into the generator. 1 Liter of urine gives you 6 hours of electricity.

I wonder about the efficiency : you still have to feed it electricity to extract the hydrogen in the first place, right ?

David Petraeus resigns as director of the CIA, citing an extramarital affair. I've heard a lot of people saying this has more to do with the possibility that he may have let slip some rather confidential information to his lady friend.

@Alan, yeah, from what I hear it's common for people in the intelligence industry to get fired over affairs like this. There's always a possibility of information getting leaked so the gut reaction is to fire someone.